.box {
  width: 100%;
  border: 1px solid #d9d9d9;
}

.header {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  padding: 8px 20px;
  cursor: pointer;
  background: #F7F7F7;
  border-bottom: 1px solid #d9d9d9;
}

.children {
  position: relative;
  padding: 10px;
  display: flex;
  flex-flow: row wrap;
  align-items: flex-start;
  align-content: flex-start;
}

.addTip {
  width: 100%;
  height: 50px;
  line-height: 50px;
  text-align: center;
  color: #999;
}

.hide {
  .children {
    height: 0;
    overflow-y: hidden;
    padding: 0;
  }

  .header {
    border-bottom: none;
  }
}